123340521121 has 4 divisors (see below), whose sum is σ = 123366443200. Its totient is φ = 123314599044.

The previous prime is 123340521077. The next prime is 123340521137. The reversal of 123340521121 is 121125043321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121125043321 = 12923 ⋅9372827.

It is a cyclic number.

It is not a de Polignac number, because 123340521121 - 2⁷ = 123340520993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123340521191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12953901 + ... + 12963418.

It is an arithmetic number, because the mean of its divisors is an integer number (30841610800).

Almost surely, 2^123340521121 is an apocalyptic number.

It is an amenable number.

123340521121 is a deficient number, since it is larger than the sum of its proper divisors (25922079).

123340521121 is an equidigital number, since it uses as much as digits as its factorization.

123340521121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25922078.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 123340521121 its reverse (121125043321), we get a palindrome (244465564442).

The spelling of 123340521121 in words is "one hundred twenty-three billion, three hundred forty million, five hundred twenty-one thousand, one hundred twenty-one".